Illustration of a heraldic rampant lion on hind legs, like those found on a coat of arms
Hello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.ello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.
For best results, apply wood ash in the winter, and apply no more than 2 pounds per 100 square feet, every two to three years. To raise the pH of your soil by about one point: In sandy soil: add 3 to 4 pounds of ground limestone per 100 square feet. In loam (good garden soil): add 7 to 8 pounds per 100 square feet. In heavy clay: add 8 to 10 pounds per 100 square feet. Alkaline Soil. If your soil is higher than 6.8, you will need to acidify your soil. Soils in the western U.S., especially in arid regions, are typically alkaline. Soil is usually acidified by adding ground sulfur.